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Abstract

The scheme described below minimizes the penalty experienced during a serious cross-interrogation of one processor by another.

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United States

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English (United States)

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Cross Interrogate Caches in Tightly Coupled Multiprocessor Systems

The scheme described below minimizes the penalty experienced during a
serious cross-interrogation of one processor by another.

Suppose, in a tightly coupled multiprocessor system, each
processor has its own store-in cache keeping the recently referenced
data. When one processor requests a data line and finds it in a
remote processor's cache, a cross-interrogate (XI) event occurs if
the request is exclusive or the line is already held exclusively.

The most serious and concerned event is when the line cannot be
shared and has to be invalidated in the remote cache for consistence.

In this case, disregard how close these two caches are; both
processors experience the penalty of waiting for the line to be
removed from the remote cache before transferring it to the
requesting processor. The organization described below minimizes the
above penalty on the processor being cross-interrogated.

The figure shows a two-way multiprocessor in Which each processor has a
cache as usual and, in addition, an XI cache holding only those lines which have
been involved in XI castout; i.e., on an XI castout event, move the line to the
requesting processor's XI cache but not the main cache. Each type of cache has
its own directory so that concurrent accesses are possible and the total cache
size is obviously increased. Now, during an XI castout, the remote processor will
no longer be held up if it is not currently accessi...